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3 years ago

Can someone please help me with my math?

Mathematics

1 answer:

aev [14]3 years ago

5 0

Answer:

Answer A, 4x^2-2x-10

Step-by-step explanation:

Since we are subtracting the first listed equation from the second, we have to switch the order of those two. The second row will all become negative (just the second, not the first) since this is subtraction. You add the numbers from there and remember to keep your coefficients and variables in line (x^2 to x^2, x to x, etc.)

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Find the quotient of (-5+ i)/(-7 + i)

kari74 [83]

Use the complex conjugate of (-7 + i) to remove the complex number from the denominator and then simplify.
See attached.

6 0

3 years ago

X^3-2x^2+5x-10=0<br> how do you solve or factor this polynomial?

pshichka [43]

$\bf x^3-2x^2+5x-10=0\implies \stackrel{\textit{doing some grouping}}{(x^3-2x^2)+(5x-10)}=0 \\\\\\ \stackrel{\textit{common factoring}}{x^2\underline{(x-2)}+5\underline{(x-2)}}=0\implies \stackrel{\textit{more common factoring}}{\underline{(x-2)}(x^2+5)}=0 \\\\[-0.35em] ~\dotfill\\\\ x-2=0\implies x=2~~~~\textit{\large\checkmark} \\\\[-0.35em] ~\dotfill\\\\ x^2+5=0\implies x^2=-5\implies x=\sqrt{-5}\implies x=i\sqrt{5}\quad \bigotimes$

7 0

3 years ago

Lisa and Lori each dried 1/3 of the glasses. What fraction of the glasses

Yuki888 [10]

3/3-1/3= 2/3 of the glasses

6 0

3 years ago

Isabel need to cut a square piece of wood with the area of 70 in.² approximate the size of the square round to the nearest 10th

babymother [125]

Answer:

8.4 in by 8.4 in

Step-by-step explanation:

The area of a square is the side length squared.

Let s be the side length:

s^2 = 70

s = \sqrt(70) = 8.4 in

3 0

3 years ago

From an 8- foot board, a carpenter sawed off one piece that was 2 3/4 feet long and another piece that was 3 1/2 feet long. How

alexdok [17]

Answer:

1 3/4 or 1.75

Step-by-step explanation:

An easy way to do this is to convert to decimals

1/4 = 0.25

2/4 = 0.5

3/4 = 0.75

Now, for the numbers for this problem.

2 3/4 would be equal to 2.75

3 1/2 would be equal to 3.5

Add those two numbers together and you get 6.25

Subtract that from 8 and you get 1.75 or 1 3/4

3 0

3 years ago